You need a PAN card to join the Amazon affiliate program in India. Amazon requires you to provide valid tax information during the sign-up process. The PAN card is necessary for verifying your identity and complying with tax regulations. Without a PAN card, you cannot receive payments through bank transfers in India. You can still sign up for the program if you do not have a PAN card, but you will not be able to receive payments until you provide it. You should apply for a PAN card if you are serious about affiliate marketing and earning commissions from Amazon.